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  • Question

  • The outputs of the 74138 octal decoder are enabled when the enable inputs are
    The outputs of the 74138 octal decoder are enabled when the enable inputs are . True False.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • True 

    • MSI Logic Circuits problems

    Search Results

    • 1. The 74139 dual four-line demultiplexer functions as a demultiplexer if data input is on the line.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. A four-line multiplexer must have as inputs four data inputs and two select inputs.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. Output 3 of a 74138 octal decoder is selected when it is enabled by a data input of:
      A0 = 1
      A1 = 1
      A2 = 0

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. All outputs of the 74138 octal decoder are disabled (HIGH) when the enable inputs are:

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. A device that determines which of two numbers is greater is a comparator.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. In order to select data input I1 of a 74151 eight-line multiplexer, the select inputs must be:

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. When data input I5 of a 74148 octal-to-binary encoder is active, the data output is:
      A0 = 1
      A1 = 0
      A2 = 0

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. Incandescent 7-segment displays are especially well suited for use in portable battery-operated devices.

    • Options
    • A. True
    • B. False
      • Discuss
    • 9. When data input I4 of a 74148 octal-to-binary encoder is active, the data output is:
      A0 = 1
      A1 = 1
      A2 = 0

    • Options
    • A. True
    • B. False
      • Discuss
    • 10. In HDL, the operation of the DEMUX is exactly described using a ________.

    • Options
    • A. function
    • B. process
    • C. variable type
    • D. number of conditional signal assignment statements
      • Discuss

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